I Went To The Hospital Thinking I Had A Kidney

i went to the hospital thinking i had a kidney stone and 5 hours later send me home telling me I have deep muscle spasms in my left lower back.
Its been 3 days and the pain is still on a scale of 1 to 10, its a 6.
My question is will stretching help this at all? I heat and then ice, I head and then ice. The only thing that seems to help is pain pills. Which I prefer not to take, but I am miserable.